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(a) Proton conductivity of recast Nafion, Nafion–graphene, and Nafion-S-graphene (sulfonated graphene) composite membranes as a function of relative humidity. (b) Performance of H2/O2 PEFC with recast Nafion, Nafion-graphene, and Nafion-S-graphene composite membranes at 100% RH at 70 °C under atmospheric pressure. Reprinted with permission from reference [94]. Copyright 2016 American Chemical Society.
